Define relative velocity of one object w.r.t. another object. Draw position –time graphs for two objects moving along a straight line; when their relative velocity is (i) zero (ii) positive and (iii) negative..
Relative velocity is defined as the difference velocities of two vectors.
i.e.
1) Positive relative velocity i.e. VA> VB
2) Zero relative velocity VA= VB
3) Negative relative velocity VA<VB
i.e.
1) Positive relative velocity i.e. VA> VB
2) Zero relative velocity VA= VB
3) Negative relative velocity VA<VB